Is the power in the pods or 4 into 1?

[glib]

On my 80 GS750E, I run the K&N stock replacement filter and a RC 4-1 pipe. All I did was step up the mains from 112.5 to 115.5. No flat or fat spots, just a good running engine through out the RPM range. Though remember I'm at 4,000 ft and do a lot of riding there to 9,000+ft. Surely your 1100ES had bigger main jets then 112.5 because those are the stock size in my 750.

I have no idea why the ES comes with 112.5 stock jet but it's true. Mine had 115s and I still think it was lean--pinging from a stop when it gets warm (normal temp range).

The DJ and Mikuni jets use a different number system(one being size and the other flow rate but cant remember which is which). There are conversion charts available on line (there are also approximate scale factor ratios) or you (what I do) can just remember to subtract 10 from the DJ to get the approximate Mikuni jet number. So the 112.5 Mikuni is like a 122.5 DJ or the closest you can get.

If everything is bone stock and you have a California bike you can figure to have to increase the jet two steps (I think I mentioned this before).

Don't even mess with the DJ kits. Just order a set of Mikuni's that are 117.5.

This would be like a 128 DJ .


If you want to get involved also get a set of 120 Mikunis and see if that is too rich for the bike. You are kind of splitting hairs now and without an O2 sensor it is going to be hard to tell.

If it doesn't pop on decel and does not hunt on part throttle then you are good.

As an example with an 1981 GS750 bone stock but a paper filter CA bike, it ran very well although a little lean on stock jets. I put in 1100 intake cam and it then hunted at part throttle. I went up two steps and it was perfect.

As I mentioned before you only need the DJ kit if you go 4:1 because the scavenging effect of teh 4:1 needs to lean out the mixture at the mid RPM where the system is in reverse flow(I forget the correct term).

I was glad when you said previously that I would not need the DJ kit. I didn't want to spent he money on it anyway. Turns out I had 122.5s in another bike. The PO had tried to make them work with pods and it just wasn't working. I put the jet kit in that bike (which now I found needs a head gasket) so this morning I put the 122.5s in my ES with a K&N filter I had. I could see that they were slightly bigger than the 115s that had been in there. Definitely not hogged out like the DJ 138s in the stage three kit. They were also marked the same way as the Suzuki jets for what it's worth. I just took it for a quick ride and I could not detect a flaw in it now. Really sweet. You may be right that 122.5 is bigger than necessary. Is there any potential damage to being up a step more than necessary?

[posplayr]

being a little rich only eats up more gas and adds a little more power. It is better to prevent predetonation and will make the pipe a little sooty. generally when jetting you go fat (rich) and back it off from there.

I would guess since it runs fine at 122.5 that you might get some mid range bobble with the 120's which you would have to hassle to find out.